随笔分类 - LeetCode
摘要：From any string, we can form a subsequence of that string by deleting some number of characters (possibly no deletions). Given two strings source and
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摘要：Return the lexicographically smallest subsequence of s that contains all the distinct characters of s exactly once. Note: This question is the same as
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摘要：Given the root of a binary tree, consider all root to leaf paths: paths from the root to any leaf. (A leaf is a node with no children.) A node is insu
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摘要：You have n tiles, where each tile has one letter tiles[i] printed on it. Return the number of possible non-empty sequences of letters you can make usi
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摘要：Given words first and second, consider occurrences in some text of the form "first second third", where second comes immediately after first, and thir
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摘要：Given a matrix and a target, return the number of non-empty submatrices that sum to target. A submatrix x1, y1, x2, y2 is the set of all cells matrix[
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摘要：Given two numbers arr1 and arr2 in base -2, return the result of adding them together. Each number is given in array format: as an array of 0s and 1s,
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摘要：You are given an binary matrix . You can choose any number of columns in the matrix and flip every cell in that column (i.e., Change the value of the
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摘要：For two strings and , we say " divides " if and only if ( concatenated with itself 1 or more times) Given two strings str1 and str2, return the larges
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摘要：In a warehouse, there is a row of barcodes, where the barcode is . Rearrange the barcodes so that no two adjacent barcodes are equal. You may return a
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摘要：Given an array of positive integers (not necessarily distinct), return the lexicographically largest permutation that is smaller than , that can be ma
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摘要：Today, the bookstore owner has a store open for minutes. Every minute, some number of customers ( ) enter the store, and all those customers leave aft
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摘要：Given a string s, consider all duplicated substrings: (contiguous) substrings of s that occur 2 or more times. The occurrences may overlap. Return any
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摘要：Students are asked to stand in non decreasing order of heights for an annual photo. Return the minimum number of students that must move in order for
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摘要：You are given an array of integers stones where stones[i] is the weight of the ith stone. We are playing a game with the stones. On each turn, we choo
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摘要：Given a list of words, each word consists of English lowercase letters. Let's say is a predecessor of if and only if we can add exactly one letter any
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摘要：Given a string of lowercase letters, a duplicate removal consists of choosing two adjacent and equal letters, and removing them. We repeatedly make du
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摘要：We have a collection of stones, each stone has a positive integer weight. Each turn, we choose the two heaviest stones and smash them together. Suppos
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摘要：Given an integer array , you should partition the array into (contiguous) subarrays of length at most . After partitioning, each subarray has their va
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摘要：You have gardens, labeled from to , and an array where describes a bidirectional path between garden to garden . In each garden, you want to plant one
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